Across
- 5. Gases trapping heat in the atmosphere
- 8. Contamination of air, water, or land
- 9. Release of harmful gases into the atmosphere
Down
- 1. Complex networks of living organisms and their environment
- 2. Main component of greenhouse gas causing global warming
- 3. Actions that meet present needs without compromising future
- 4. Energy sources that can be replenished
- 5. Widespread climate change affecting the entire planet
- 6. Increase in Earth's average temperature
- 7. Fuels formed from ancient organisms